A fluid delivery apparatus comprises a first piston body, a second piston body, a fluid delivery pipe, and a sealing element. The first piston body has a first through hole, a first connecting portion, an accommodation space and a buffer space. The second piston body has a second through hole and a second connecting portion disposed inside the accommodation space. The fluid delivery pipe is accommodated in the first through hole and the second through hole, and movable between a first position and a second position. The sealing element encircles the fluid delivery pipe. When the fluid delivery pipe is at the first position, the sealing element is accommodated in the accommodation space. When the fluid delivery pipe is at the second position, a first part of the sealing element is accommodated in the accommodation space, and a second part of the sealing element is accommodated in the buffer space.本發明揭露一種流體輸送裝置，具有第一活塞座體、第二活塞座體、流體輸送管與密封件。第一活塞座體具有第一連通孔與第一連接部，第一連接部定義有容置空間與連通的緩衝空間。第二活塞座體具有第二連通孔與第二連接部，且至少部分的第二連接部設置於容置空間中。流體輸送管容置於第一連通孔與第二連通孔中，可移動地位於第一位置與第二位置之間。密封件套設於流體輸送管外側，當流體輸送管位於第一位置時，密封件位於容置空間中，當流體輸送管位於第二位置時，部分的密封件位於容置空間中，且部分的密封件位於緩衝空間中。
